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Fig. 7. Effect of luminal L-histidine (L-His; 20 µmol
l1) and both Cu+ and Cu2+ (50 µmol
l1) on the kinetics of transmural transport of
65Zn2+ (1501000 µmol l1)
measured over 30 min time intervals at each luminal
65Zn2+ concentration. Unidirectional fluxes were
calculated from regression slopes determined over this time interval for each
65Zn2+ concentration. Values displayed are means
± S.E.M. of 3 replicates per concentration.